EP3827890B1 - Dispositif de traitement et procédé de traitement du liquide de processus à charge solide - Google Patents

Dispositif de traitement et procédé de traitement du liquide de processus à charge solide Download PDF

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Publication number
EP3827890B1
EP3827890B1 EP20209876.0A EP20209876A EP3827890B1 EP 3827890 B1 EP3827890 B1 EP 3827890B1 EP 20209876 A EP20209876 A EP 20209876A EP 3827890 B1 EP3827890 B1 EP 3827890B1
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EP
European Patent Office
Prior art keywords
process liquid
flotation tank
solids
filter
removal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP20209876.0A
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German (de)
English (en)
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EP3827890A1 (fr
Inventor
Harald Mali
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Lubot Schmierstoff und Prozesstechnik GmbH
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Lubot Schmierstoff und Prozesstechnik GmbH
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Publication of EP3827890A1 publication Critical patent/EP3827890A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/16—Flotation machines with impellers; Subaeration machines
    • B03D1/18—Flotation machines with impellers; Subaeration machines without air supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2405—Feed mechanisms for settling tanks
    • B01D21/2411—Feed mechanisms for settling tanks having a tangential inlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0018—Separation of suspended solid particles from liquids by sedimentation provided with a pump mounted in or on a settling tank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
    • B01D21/0066—Settling tanks provided with contact surfaces, e.g. baffles, particles with a meandering flow pattern of liquid or solid particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0084—Enhancing liquid-particle separation using the flotation principle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/10—Settling tanks with multiple outlets for the separated liquids
    • B01D21/12—Settling tanks with multiple outlets for the separated liquids with moving scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/245—Discharge mechanisms for the sediments
    • B01D21/2455—Conveyor belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/044—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are pervious for filtering
    • B01D33/048—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are pervious for filtering with endless filtering bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/08—Subsequent treatment of concentrated product
    • B03D1/082—Subsequent treatment of concentrated product of the froth product, e.g. washing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/08—Subsequent treatment of concentrated product
    • B03D1/087—Subsequent treatment of concentrated product of the sediment, e.g. regrinding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1462—Discharge mechanisms for the froth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1475—Flotation tanks having means for discharging the pulp, e.g. as a bleed stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1487—Means for cleaning or maintenance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/16—Flotation machines with impellers; Subaeration machines
    • B03D1/20—Flotation machines with impellers; Subaeration machines with internal air pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2221/00—Applications of separation devices
    • B01D2221/14—Separation devices for workshops, car or semiconductor industry, e.g. for separating chips and other machining residues

Definitions

  • the present invention relates to a treatment device for treating process liquid laden with solids by separating the process liquid and the solids, with a filter system having a separating filter for filtering the solids from the process liquid being provided in the treatment device, with a process liquid container in the treatment device for holding is provided in the filter system filtered process liquid.
  • Machine tools such as lathes, milling machines, grinding machines, etc., for the machining of workpieces, in particular made of metal, or other processing machines, work with water-mixed or non-water-mixed cooling lubricants (hereinafter only briefly referred to as lubricant).
  • lubricant water-mixed or non-water-mixed cooling lubricants
  • the lubricant is circulated around the machine to cool and lubricate the tool.
  • solids such as chips of various sizes, grinding debris, etc. are also transported away with the lubricant.
  • the lubricant loaded with the solids is freed from the solids in a treatment unit and the pure lubricant is collected in a lubricant tank and, if necessary, fed back to the processing point by means of a pump.
  • Liquids that are contaminated with solids can also be used in other machining processes, for example cleaning liquids for cleaning machines or systems. In the following, therefore, the term process liquid, such as
  • Known devices are, for example, sedimentation or flotation filter systems.
  • flotation filter systems the liquid laden with solids is collected in a container. Air is supplied to the container from the outside. The supplied air forms air bubbles that adhere to the solids, causing the solids to rise to the surface and collect there. The solids on the surface can then be removed. An example of this can be found in the EP 140 310 A2 .
  • the solids sink to the bottom and are removed from there.
  • the desired degree of purity of the liquid for use in a machine tool or another machining process cannot usually be achieved.
  • Belt filter systems are also known, with either a fleece filter or an endless belt being used for filtering.
  • An endless belt is run in a circle and continuously for filtering used, whereas a fleece is transported away with the filter cake and has to be constantly replaced.
  • the process liquid loaded with solids is guided over the filter belt on which the solids are separated.
  • the solids form a filter cake on the filter belt and the process liquid runs through the filter cake and filter belt and can be collected below.
  • the filter cake that builds up supports the filtering.
  • the liquid level above the filter belt is measured. If the liquid level exceeds a defined level, the filter belt is moved a little further so that the filter performance is increased by the unloaded filter belt.
  • the EP 29 222 A2 describes an integrated flotation filtration system with a tank through which a belt filter runs diagonally.
  • the belt filter separates the tank into a clean zone below the belt filter and a flotation zone above the belt filter. Due to sedimentation, sinking solid particles are deposited on the belt filters in the tank. In addition, rising solid particles that collect on the belt filter in the upper area of the tank are carried away by flotation. Below the belt filter is therefore pure process liquid, which can be taken from the tank. A downstream filtration is not planned.
  • the construction of the flotation filtration system is complex because the moving filter belt in the tank must be sealed off from the tank wall in order to prevent contaminated process liquid from flowing crosswise from the flotation zone into the clean zone. Apart from that, a large amount of process liquid has to flow through the belt filter and a filter cake that is too dense on the belt filter has to be prevented in order to prevent blockages.
  • a band filter system is known in which the lubricant filtered on the band filter is passed through an aggregator, in which the remaining fine solid particles grow together to form larger solid particles, and from the aggregator again passed through the band filter.
  • This allows the purity of the filtered lubricant to be increased.
  • this does not solve the problem of poor filter cake build-up on the belt filter and the high consumption of belt filters.
  • the band filter has to process an even larger amount of lubricant.
  • the U.S. 5,176,837 discloses a sedimentation tank which receives process liquid with particles from a reservoir via line.
  • the process liquid is fed to a filter system and cleaned via an overflow and a floor drain.
  • a venturi pump is used to create a vacuum in the filter system, which receives liquid through a filter in the tank.
  • the sampling line is located at the top of the filter at the top of the tank and uses the pump to deliver particle-free liquid to the venturi pump.
  • sedimentation is used in combination with a filter system to clean up the process liquid.
  • a flotation tank and a feed line for feeding in impure process liquid laden with solids and mixed with air bubbles are provided in the treatment device, the feed line being connected to the flotation tank and solid particles in the flotation tank being collected by flotation in an upper Area and collect by sedimentation in a lower bottom area of the flotation tank that forms in the flotation tank between the upper area and the bottom area an extraction area with process liquid and an extraction line is provided, wherein the extraction area is in the lower third of the flotation tank above the bottom area to process liquid from removed from the removal area and/or a channel is provided in the flotation tank which opens out at one end in the area of the bottom area and at the opposite end opens out into a removal container separate from the flotation tank and a second removal line is provided in order to remove process liquid from the removal container, and that lines are provided in the processing device in order to load the separating filter from the upper area of the flotation tank and from the bottom area of the flotation tank with process liquid laden with solids.
  • Flotation and sedimentation in the flotation tank create areas with an increased concentration of solids in the upper and lower areas. This means that less process liquid has to be routed through the separating filter of the filter system, which means that the filter system for separating the solids uses a smaller amount of process liquid must be acted upon. This reduces the risk of blockages and backwater of process liquid at the separator filter. At the same time, a thicker filter cake can build up on the separator filter, which supports filtration. At the same time, the consumption of the separating filter can be reduced or the frequency of cleaning the separating filter can be reduced.
  • the filter system can thus also be dimensioned smaller because it has to produce a smaller liter capacity per unit of time.
  • (Highly) pure process liquid can be removed from the process liquid container via the removal line and made available for further use, for example in a processing machine.
  • the process liquid in the process liquid tank has a high purity class, which depends in particular on the design of the filter system and which can be adapted to the respective requirement.
  • a removal area for process liquid is formed, from which process liquid is removed with a second removal line.
  • This process liquid can already be regarded as pure process liquid, but usually has a lower cleanliness class than the process liquid in the process liquid container. Process liquids with different cleanliness classes can thus be provided with the treatment device. Such a pure process liquid can also be provided if the process liquid in the Flotation tank is promoted over the bottom area by means of a channel in a removal tank.
  • a return line that connects the process liquid tank to the flotation tank to supply process liquid from the process liquid tank to the flotation tank, the circulation of process liquid can be maintained in an internal circuit even when the treatment plant is not currently processing impure process liquid.
  • the filter performance can be increased if the filter system is designed in several stages with a coarse filter, which is loaded with process liquid from the upper area of the flotation tank and from the bottom area of the flotation tank, and with a fine filter, which is loaded with process liquid coarsely filtered in the coarse filter, with the Process liquid container that receives the process liquid filtered in the fine filter.
  • the separating filter from the bottom area of the flotation tank is only temporarily charged with process liquid laden with solids, particularly when sufficient solids have accumulated in the bottom area.
  • the separation capacity of the processing device can be increased if solids are conveyed from the bottom area of the flotation tank and/or from the top area with a solids conveyor from the flotation tank.
  • FIG.1 An embodiment of a processing device 1 according to the invention for a process liquid from a processing machine 2 in an exemplary embodiment is shown in Fig.1 shown.
  • the process liquid is used for the machining process.
  • Any liquid process fluid for the processing machine 2 that is required to carry out a processing process and that is contaminated with solids, such as chips, abrasion debris, etc., and is discharged from the processing machine 2 is understood as a process liquid.
  • the impure process liquid loaded with solids is discharged from the processing machine 2 and fed to the treatment device 1 via a feed line 3, for example by providing a corresponding gradient in the feed line 3 or by a lifting pump.
  • the solids are removed from the impure process liquid down to a specific purity class.
  • the (highly) pure process liquid can then be fed to the processing machine 2 via a discharge line 4 of the processing device 1 and used there for the processing process.
  • the process liquid can thus be conveyed in a circle via the processing machine 2, but this is not absolutely necessary.
  • a high-purity process liquid can be fed to the processing machine 2 via the discharge line 4 and a pure process liquid, i.e. with a lower purity class than the high-purity process liquid, can be fed to the processing machine 2 via a further discharge line 5 of the treatment device 1 .
  • the process liquid processed in the processing device 1, also in the various cleanliness classes, can also be fed to other processes, for example other processing machines or other processing processes in the processing machine 2, as shown in Fig.1 indicated by torn lines.
  • a flotation tank 10 In the processing device 1 according to the invention, a flotation tank 10, a filter system 20 and a lubricant container 30 for receiving (highly) pure process liquid are provided.
  • the impure process liquid for example from the processing machine 2, is first fed to the flotation tank 10, for example from above or in the upper region 14, with another feed also being conceivable in principle.
  • the impure process liquid is preferably supplied in a tangential direction (relative to the circumference of the flotation tank 10), as a result of which the process liquid circulates in the flotation tank 10 in the circumferential direction (a so-called hydrocyclone operation).
  • a circulation in the flotation tank 10 is not absolutely necessary.
  • the impure process liquid from the processing machine 2 usually comes into the flotation tank 10 with many air bubbles offset. These air bubbles 13 can be used in the flotation tank 10 at the same time for separating the solids in the process liquid.
  • the air bubbles 13 rise in the flotation tank 10, taking with them solid particles up to a certain size and weight. These smaller and lighter solid particles 14, for example fine abrasion and chips up to a certain size, collect in the upper area 14 of the flotation tank 10. It would also be possible to use air (or another gas) to generate air bubbles 13 from the outside to be fed into the flotation tank 10. The larger and heavier solid particles 15, for example larger chips, sink to the bottom of the flotation tank 10 and collect there in the bottom area 15.
  • the solids in the process liquid are thus concentrated in the upper area 14 by flotation of the solids to the surface and in the bottom area 15 by sedimentation.
  • a removal area 16 with pure process liquid is thus formed in the area between the upper area 14 and the bottom area 15.
  • This extraction area 16 is in the lower third of the flotation tank 10 above the bottom area 15.
  • This process liquid can still be mixed with solid particles in a certain size distribution, but can already be regarded as a pure process liquid and can be used for less sensitive tasks. For example, certain processes in the processing machine 2 that do not require a highly pure process liquid can be supplied with this pure process liquid.
  • This pure process liquid can be removed from the removal area 16 with a removal line 18 and a circulating pump 17 and fed, for example, via the feed line 5 for pure process liquid to the processing machine 2 or other processes or systems.
  • the process liquid from this removal area 16 does not necessarily have to be used for a machining process.
  • the removal from the removal area 16 can also be used for internal circulation, for example for circulation if there is no return flow of process liquid from the processing machine 2 into the treatment device 1.
  • the pure process liquid from the removal area 16 could also be fed through an additional solids filter 19 (indicated in Fig.1 ) to increase the cleanliness class before the clean process fluid is reused.
  • Any suitable solids filter 19 can be used for this purpose.
  • the solids filter 19 is only slightly loaded with solids.
  • Filter systems 20 are known in various designs and can all be used, for example as backflush filters, vacuum filters, overpressure filters, also in each case as endless belt filters or fleece belt filters.
  • Such filter systems 20 have in common that the liquid to be cleaned, here specifically a process liquid, is guided through a separating filter 21, where the solids separate and collect and the liquid passes through.
  • the filter system 20 of the exemplary embodiment comprises a separating filter 21, for example an endless filter belt with a revolving belt filter 21 or a fleece belt that is unwound from a roll 22 (as in Fig.1 ).
  • a drum 23 which is perforated at least in the lower area can be provided in the filter system 20 .
  • On the inside of the drum 23 is in the lower part of the separating filter 21.
  • the process liquid loaded with solids is fed into the drum 23 via a filter feed line 11, either by providing a gradient in the filter feed line 11 (as in Fig.1 ) or with the help of a pump.
  • the process liquid supplied to the drum 23 flows through the separating filter 21, as a result of which solids are separated at the separating filter 21 and a filter cake from the separated solids builds up at the separating filter 21.
  • the filter cake supports the filtration of the process liquid.
  • a level monitor is provided in the drum 23 . If the process liquid level in the drum 23 rises above a predetermined level, the separating filter 21 is moved further with the filter cake and fresh separating filter 21 is supplied, or the separating filter 21 is cleaned, for example by backwashing or mechanical removal of the filter cake. This allows the process liquid to drain off more quickly and the level drops.
  • the process liquid can only flow poorly through the filter cake and the process liquid level rises rapidly in the drum 23, which consumes a lot of the separating filter 21 because the separating filter 21 has to be moved frequently. In other versions of the filter system 20, frequent cleaning of the separating filter 21 may be necessary. Similar problems arise when the amount of liquid that is passed through the separating filter 21 is too large. The discharged separating filter 21 (if no endless band filter is used) with the filter cake is collected in a container 24 and can thus be removed.
  • the (highly) pure process liquid flowing through the separating filter 21 and freed from solids is collected in a process liquid container 30 .
  • the degree of purity of the process liquid in the process liquid container 30 naturally depends primarily on the selected filter system of the filter system 20, in particular on the solid particle sizes up to which the filter system 20 filters. Of course, this can also be adapted to the respective requirements of the processing device 1 .
  • the pure process liquid can be removed from the process liquid container 30 via an extraction line 31 and transported via a circulation pump 32 and the supply line 4 or other lines from the processing device 1, for example into the processing machine 2.
  • the filter system 20 is not loaded directly with the process liquid from the processing machine 2, but with process liquid from the flotation tank 10.
  • Process liquid from the flotation tank 10 is drawn both from the upper area 14 and from the lower bottom area 15 removed and fed to the band filter system 20 via the process liquid line 11, or via separate lines from the different areas.
  • a removal device is provided in the bottom area 14 for removal from the bottom area 15 of the flotation tank 10 .
  • the removal device can be designed differently.
  • a soil extraction line 12 in which a feed pump 29 is arranged is provided as the extraction device.
  • the bottom extraction line 12 opens into the filter feed line 11 with which process liquid is removed from the upper area of the flotation tank 10 .
  • process liquid can also be fed directly to the belt filter 21 in the belt filter system 20 via the bottom extraction line 12 .
  • the bottom extraction line 12 can also be routed inside the flotation tank 10 and could convey the solids in the bottom area 15 to the surface in the upper area 14 of the flotation tank 10 or into an overflow channel 41 (as in Fig.3 ), from where they can be removed by means of the filter feed line 11.
  • the filter performance of the filter system 20 can be improved if the impure process liquid from the processing machine 2 is first pretreated in the flotation tank 10 and the entire process liquid is not routed directly through the belt filter system 20 .
  • the separation of the solids in the flotation tank 10 increases the concentration of the solids in the process liquid in the upper area 14 and in the bottom area 15 . Because of this, the entire quantity of process liquid no longer has to be passed through the filter system 20, but only the process liquid with increased solids concentration collecting in the upper area 14 and the process liquid with increased solids concentration removed from the bottom area 15. This reduces the amount of liquid to be processed in the belt filter system 20 , giving the filter cake more time to build up on the belt filter 21 .
  • Process liquid from the bottom area 15 does not have to be permanently removed and fed to the filter system 20 . It is sufficient if the process liquid is only removed from the bottom area 15 when a certain amount of solid particles has accumulated there.
  • the removal device, such as the feed pump 29, therefore does not have to be in constant operation, which helps to reduce energy consumption.
  • a corresponding line from the removal area 16 for pressurizing the filter system 20 can be provided for this purpose.
  • a return line 33 can also be provided, which connects the process liquid container 30 to the flotation tank 10 .
  • a return pump 34 is arranged in the return line 33 in order to deliver (highly) pure process liquid from the process liquid container 30 into the flotation tank 10 .
  • the return line 33 preferably opens into the flotation tank 10 in the upper area 14 or above the center of the flotation tank 10.
  • the return line 33 particularly advantageously opens out in the tangential direction into the flotation tank 10 in order to maintain or support the circulation in the flotation tank 10. This means that filtering can continue in the internal circuit, although there is no request and therefore no return of contaminated process liquid from the processing machine 2 .
  • a volume compensation when the process liquid container 30 is overfilled can also be realized in this way.
  • the level in the process liquid container 30 can also be maintained in this way.
  • a stand-by mode (weekend operation) can thus be implemented in order to keep the processing device 1 ready for operation with little energy expenditure, even if no process liquid is flowing back into the processing device 1 .
  • the return line 33 and the return pump 34 can also be used to equalize the level in the flotation tank 10 in order to always keep the liquid level in the flotation tank 10 in a range that is advantageous for the separation.
  • a multi-stage filter system 20 can also be provided, as in Fig.2 shown.
  • a coarse filter 25 as referred to in FIG Fig.1 described applied with process liquid from the flotation tank 10.
  • the process liquid roughly pre-filtered therein is fed to a fine filter 26 .
  • the coarse filter 25 and the fine filter 26 can, like the filter system 20 in Fig.1 be carried out, but can of course also be carried out in the form of other filter systems.
  • the process liquid filtered in the fine filter 26 is collected again in a process liquid container 30 .
  • the fine filter 26 can also be charged with process liquid from the extraction area 16 of the flotation tank 10 , permanently or temporarily.
  • a line 27 can be provided for this purpose, which connects the flotation tank 10 to the fine filter 27 .
  • a feed pump 28 to Promotion of the lubricant from the flotation tank 10 may be provided, or a level difference setting, so that a flow is created via the hydrostatic level difference.
  • the removal from the removal area 16 for loading the fine filter 26 can also be carried out as follows with reference to FIG Fig.3 be executed as described.
  • FIG.3 A further embodiment of the flotation tank 10 is shown, the remaining components of the treatment device 1, such as the filter system 20, lines, etc., not being shown for the sake of simplicity.
  • a mechanical conveyance of the solids from the bottom area 15 is additionally provided, with which, in particular, very large solids are removed from the flotation tank 10.
  • the processing plant 1 can also make its own chip separation device in the processing machine 2 obsolete because the flotation tank 10 is better able to process sinking and floating solids, which are therefore of different weights.
  • chips that are lighter than solids, such as aluminum and plastic chips can be separated well by flotation.
  • the impure process liquid is returned to the flotation tank 10 via a feed line 3 .
  • certain solids fractions rise to the upper region 14 of the flotation tank 10 by flotation, where they reach an overflow channel 41, for example via an overflow, from where they can be fed to the filter system 20 (not shown) via the filter feed line 11.
  • Such an overflow 40 with overflow channel 41 can of course also be used in the design of the flotation tank 10 Fig.1 be provided.
  • a solids conveyor 42 for example a scraper conveyor, is provided in the flotation tank 10 , which conveys solids from the bottom area 15 of the flotation tank 10 out of the flotation tank 10 .
  • the solids conveyor 42 extends, for example, from the bottom area 15 beyond the upper area 14 of the flotation tank 10, as shown in FIG Fig.3 shown. Solids removed with the solids conveyor 42 , such as chips, can be collected in a solids container 43 .
  • Solids that neither rise to the upper area 14 nor are removed from the bottom area 15 by the solids conveyor 42 collect in the bottom area 15, from where they can be removed again via a removal device, such as the removal line 12, and fed to the filter system 20.
  • Process liquid with solids from the bottom area 15 could also be fed into the overflow channel 41 in order to be conveyed into the filter system 20 with the filter feed line 11 .
  • the removal of pure process liquid from the flotation tank 10 takes place in the embodiment shown in FIG Fig.3 not directly from a removal area 16 between the top area 14 and the bottom area as in 1 .
  • a channel 44 in the flotation tank 10 provided, for example in the area of a wall of the flotation tank 10 as in Fig.3 .
  • the channel 44 extends from the bottom area 15 or above the bottom area 15 to the upper area 14 of the flotation tank 10 and is separate from the rest of the flotation tank 10.
  • process liquid can enter the channel 44 and exit at the opposite end of the channel 44. The same process liquid level is thus set in channel 44 as in flotation tank 10.
  • the channel opens into a removal container 45, for example via a connecting line 46 which connects channel 44 to removal container 45, with channel 44 also being able to open directly into removal container 45.
  • Process liquid can be removed from the removal container 45 via a removal line 18 .
  • the removal from the removal container 45 of Fig.3 thus replaces the removal from the removal area 16 in the embodiment Fig.1 .
  • This can also be done with a labyrinth-shaped floor area 15, as in Fig.3 , get supported.
  • the purity of the process liquid in the channel 44 is thus comparable to the purity of the process liquid in the extraction area 16 according to the embodiment Fig.1 .
  • the removal container 45 can also be used to control the rate at which the process liquid is removed.
  • the opening of the connecting line 46 in the removal container 45 can be designed to be adjustable in height, for example by means of a hydraulic sleeve 47 as in FIG Fig.3 , which is slidably arranged on the connecting line 46.
  • the process liquid flows more or less quickly into the extraction container 45 and thus also more or less quickly into the extraction line 18.
  • a further solids conveyor 48 can be provided, which removes chips from the upper region 14 of the flotation tank 10 and feeds them, for example, to a solids container 43 .

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Dispersion Chemistry (AREA)
  • Physical Water Treatments (AREA)
  • Filtration Of Liquid (AREA)

Claims (10)

  1. Dispositif de traitement pour le traitement d'un liquide de processus chargé de matières solides en séparant le liquide de processus et les matières solides, dans lequel, dans le dispositif de traitement (1), une installation de filtration (20) comportant un filtre de séparation (21) est prévue pour la filtration des matières solides du liquide de processus, dans lequel, dans le dispositif de traitement (1), un récipient de liquide de processus (30) est prévu pour la réception de liquide de processus filtré dans l'installation de filtration (20), caractérisé en ce que, dans le dispositif de traitement (1), sont prévus un réservoir de flottaison (10) et une conduite d'amenée (3) permettant d'amener un liquide de processus impur, chargé de matières solides et mélangé avec des bulles d'air, dans lequel la conduite d'amenée (3) est raccordée au réservoir de flottaison (10) et des particules de matière solide s'accumulent dans le réservoir de flottaison (10) par flottaison dans une zone supérieure (14) et par sédimentation dans une zone de fond (15) inférieure du réservoir de flottaison (10), en ce que, dans le réservoir de flottaison (10), une zone de prélèvement (16) comportant du liquide de processus se forme entre la zone supérieure (14) et la zone de fond (15) et une conduite de prélèvement (18) est prévue, dans lequel la zone de prélèvement (16) se situe dans le tiers inférieur du réservoir de flottaison (10) au-dessus de la zone de fond (15) pour prélever du liquide de processus de la zone de prélèvement (16) et/ou un canal (44) est prévu dans le réservoir de flottaison (10), lequel canal débouche, au niveau d'une extrémité, dans la zone de la zone de fond (15) et débouche, au niveau de l'extrémité opposée, dans un récipient de prélèvement (45) séparé du réservoir de flottaison (10), et une seconde conduite de prélèvement (18) est prévue pour prélever du liquide de processus du récipient de prélèvement (45), et en ce que, dans le dispositif de traitement (1), sont prévues des conduites (11, 12) pour alimenter le filtre de séparation (21) en liquide de processus chargé de matières solides à partir de la zone supérieure (14) du réservoir de flottaison (10) et à partir de la zone de fond (15) du réservoir de flottaison (10).
  2. Dispositif de traitement selon la revendication 1, caractérisé en ce qu'une conduite de prélèvement supplémentaire (31) est prévue pour prélever du liquide de processus pur du récipient de liquide de processus (30).
  3. Dispositif de traitement selon la revendication 1, caractérisé en ce qu'une conduite de retour (33) est prévue, laquelle raccorde le récipient de liquide de processus (30) au réservoir de flottaison (10) afin d'amener du liquide de processus au réservoir de flottaison (10) à partir du récipient de liquide de processus (30).
  4. Dispositif de traitement selon la revendication 1, caractérisé en ce que le canal (44) dans la zone supérieure (14) du réservoir de flottaison (10) est raccordé au récipient de prélèvement (45) par l'intermédiaire d'une conduite de raccordement (46), dans lequel la hauteur de la conduite de raccordement (46) est réglable dans le récipient de prélèvement (45).
  5. Dispositif de traitement selon l'une des revendications 1 à 4,
    caractérisé en ce que l'installation de filtration (20) est réalisée en plusieurs étapes, comportant un filtre grossier (25) alimenté en liquide de processus à partir de la zone supérieure (14) du réservoir de flottaison (10) et à partir de la zone de fond (15) du réservoir de flottaison (10), et comportant un filtre fin (26) alimenté en liquide de processus filtré grossièrement dans le filtre grossier (25), dans lequel le récipient de liquide de processus reçoit le liquide de processus filtré dans le filtre fin (26).
  6. Dispositif de traitement selon l'une des revendications 1 à 5,
    caractérisé en ce que, dans le réservoir de flottaison (10), un transporteur de matières solides (42) est prévu, lequel transporte des matières solides depuis le réservoir de flottaison (10) à partir de la zone de fond (15) et/ou à partir de la zone supérieure du réservoir de flottaison (10).
  7. Procédé permettant le traitement d'un liquide de processus liquide chargé de matières solides par séparation du liquide de processus et des matières solides, caractérisé en ce que le liquide de processus impur, chargé de matières solides et mélangé avec des bulles d'air est amené à un réservoir de flottaison (10) dans lequel des matières solides s'accumulent par flottaison dans une zone supérieure (14) du réservoir de flottaison (10) et par sédimentation dans une zone de fond (15) inférieure du réservoir de flottaison (10), en ce que du liquide de processus est prélevé d'une zone de prélèvement (16) du réservoir de flottaison (10) entre la zone supérieure (14) et la zone de fond (15) et est fourni à une conduite de prélèvement (18), dans lequel la zone de prélèvement (16) se situe dans le tiers inférieur du réservoir de flottaison (10) au-dessus de la zone de fond (15), et/ou du liquide de processus est transporté depuis la zone de fond (15) jusque dans un récipient de prélèvement (45) par l'intermédiaire d'un canal (44), et le liquide de processus est fourni à partir du récipient de prélèvement (45) par l'intermédiaire d'une seconde conduite de prélèvement (18), et en ce qu'un filtre de séparation (21) d'une installation de filtration (20) est alimenté en liquide de processus chargé de matières solides à partir de la zone supérieure (14) du réservoir de flottaison (10) et à partir de la zone de fond (15) du réservoir de flottaison (10) et le liquide de processus filtré dans l'installation de filtration (20) est récupéré dans un récipient de liquide de processus (30).
  8. Procédé selon la revendication 7, caractérisé en ce que du liquide de processus est prélevé du récipient de liquide de processus (30) et est fourni à une conduite de prélèvement supplémentaire (31).
  9. Procédé selon la revendication 7 ou 8, caractérisé en ce que le filtre de séparation (21) n'est alimenté que temporairement en liquide de processus chargé de matières solides à partir de la zone de fond (15) du réservoir de flottaison (10).
  10. Procédé selon l'une des revendications 7 à 9, caractérisé en ce que des matières solides sont transportées depuis le réservoir de flottaison (10) au moyen d'un transporteur de matières solides (42), à partir de la zone de fond (15) et/ou à partir de la zone supérieure (14) du réservoir de flottaison (10).
EP20209876.0A 2019-11-26 2020-11-25 Dispositif de traitement et procédé de traitement du liquide de processus à charge solide Active EP3827890B1 (fr)

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CN113577850B (zh) * 2021-08-16 2022-07-26 兰州恒达石化机械有限公司 一种可采集污泥信号控制反冲洗成套三相分离装置

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EP0140310B1 (fr) * 1983-10-20 1992-09-23 YSTRAL GmbH Procédé et dispositif pour séparer les composants des eaux résiduaires contenant des émulsions par flottation mécanique

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DE3833054C2 (de) * 1988-09-29 1995-04-20 Hoelter Heinz Verfahren zur Aufbereitung von Teichschlamm (Flotationsabgängen) und Aufbereitungsanlage
US5176837A (en) * 1991-05-06 1993-01-05 Venture Production Company Water purification system and drum bagger
DE4115819A1 (de) * 1991-05-15 1992-11-19 Schloemann Siemag Ag Verfahren zur aufbereitung von in walzwerksanlagen benutzten kuehl- und/oder schmiermitteln und hierzu eine aufbereitungsanlage
DE4135010C2 (de) 1991-10-23 1993-12-02 Liqui Maschinen Und Zubehoerha Verfahren und Vorrichtung zum Ausfiltern von Feststoffpartikeln aus Flüssigkeiten
JP2001314703A (ja) 2000-03-01 2001-11-13 Sumitomo Densetsu Corp 液体の濾過再生装置
KR200230079Y1 (ko) 2000-11-07 2001-07-03 (주)정광기공 페이퍼필터 머신의 되감김장치
DE10065846A1 (de) * 2000-12-28 2002-08-01 Stapelfeldt Frank Verfahren zum Recycling von Aminen bei der indirekten Eisenerzflotation
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EP0029222B1 (fr) * 1979-11-17 1986-07-30 Bedmor Beteiligungs- und Verwaltungsgesellschaft mbH Appareil pour flottation et filtration combinées et procédé de flottation et filtration combinées
EP0140310B1 (fr) * 1983-10-20 1992-09-23 YSTRAL GmbH Procédé et dispositif pour séparer les composants des eaux résiduaires contenant des émulsions par flottation mécanique

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AT522690B1 (de) 2021-01-15
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